The key findings were that major search engines returned risky sites in their search results for popular keywords and sponsored results contained two to four times as many dangerous sites as organic results. Overall, MSN search results had the lowest percentage (3.9%) of dangerous sites while Ask search results had the highest percentage (6.1%). Google was in between (5.3%).
http://www.siteadvisor.com/studies/search_safety_may2006.html |